Davis S T, O'Connell B C
School of Dental Science, Trinity College, Dublin, Ireland.
J Oral Rehabil. 2007 Jun;34(6):468-73. doi: 10.1111/j.1365-2842.2006.01649.x.
This study was undertaken to examine the effect of eugenol-containing and non-eugenol-containing root canal sealers on the retention strength of glass fibre endodontic posts (ParaPost Fibre White) luted with a resin cement (ParaPost cement). We also examined the mode of failure that occurred visually by using scanning electron microscopy. Seventy-two single rooted, recently extracted, premolar teeth were root canal treated and randomly divided into two groups. Group 1 was obturated with gutta percha and a calcium hydroxide-based sealer (Sealapex, Kerr). Group 2 was obturated with gutta percha and a eugenol-based sealer (Tubli-Seal Kerr). The teeth were stored for 1 week in distilled water at 37 degrees C and then prepared for 9 mm posts with a 1.40-mm drill. The matching glass fibre post was luted with a resin cement following the manufacturer's instructions. The samples were stored for 1 week and thermocycled. The posts were removed from the root canals using a calibrated testing machine in tensile mode. The mean dislodging force for group 1 was 190.46 N and for group 2 was 183.8 N, with standard deviations of 54.9 and 56.0 N respectively. The t-test indicated no significant difference between the two groups. Failure of the posts occurred mainly within the resin layer. This study showed that under experimental conditions there was no statistically significant difference between Sealapex sealer and Tubli-Seal sealer on the retention of glass fibre posts using a resin cement.
本研究旨在探讨含丁香酚和不含丁香酚的根管封闭剂对用树脂水门汀（ParaPost水门汀）粘结的玻璃纤维根管桩（ParaPost纤维白）固位强度的影响。我们还通过扫描电子显微镜观察了失败模式。72颗新近拔除的单根前磨牙进行根管治疗，并随机分为两组。第1组用牙胶尖和氢氧化钙类封闭剂（Sealapex， Kerr公司）进行根管充填。第2组用牙胶尖和含丁香酚封闭剂（Tubli-Seal Kerr公司）进行根管充填。牙齿在37℃蒸馏水中保存1周，然后用1.40mm钻头制备9mm的桩道。按照制造商的说明，用树脂水门汀粘结匹配的玻璃纤维桩。样本保存1周并进行热循环处理。使用校准测试机以拉伸模式从根管中取出桩。第1组的平均脱位力为190.46N，第2组为183.8N，标准差分别为54.9和56.0N。t检验表明两组之间无显著差异。桩的失败主要发生在树脂层内。本研究表明，在实验条件下，使用树脂水门汀时，Sealapex封闭剂和Tubli-Seal封闭剂在玻璃纤维桩的固位方面无统计学显著差异。
